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Quantum physics predicts the existence of an underlying sea of zero-point energy at every point in the universe. This is different from the cosmic microwave background and is also referred to as the electromagnetic quantum vacuum, since it is the lowest state of otherwise empty space. This energy is so enormous that most physicists believe that even though zero-point energy seems to be an inescapable consequence of elementary quantum theory... it cannot be physically real, and so is subtracted away in calculations.

A minority of physicists accept it as real energy which we cannot directly sence, since it is the same everywhere, even inside our bodies and measuring devices. From this perspective, the ordinary world of matter and energy is like a foam atop the quantum vacuum sea. It does not matter to a ship how deep the ocean is below it. If the zero-point energy is real, there is the possibility that it can be tapped as a source of power or be harnassed to generate a propulsive force for space travel.

The propellor or the jet engine of an aircraft push air backwards to propel the aircraft foward. A ship or boat propellor does the same thing with water. On Earth there is always air or water available to push against. But a rocket in space has nothing to push against, and so it needs to carry propellant to eject in place of air or water. The fundamental problem is, that a deep space rocket would have to start out with all the propellant it will ever need. This quickly results in the need to carry more and more propellant just to propel the propellant. The breakthrough one wishes for deep space travel is, to overcome the need to carry propellant at all. How can one generate a propulsive force without carrying and ejecting proplellant ?

There is a force associated with the electromagnetic quantum vacuum, (the Casimir force). This force is an attraction between parallel metallic plates that has now been well measured and can be attributed to a minutely tiny imbalance in the zero-point energy in the cavity between, versus the region outside the plates. This is not useful for propulsion, since it symmetrically pulls on the plates. However .... if some asymmetric variation of the Casimir force could be identified, one could in effect sail through space as if propelled by a kind of quantum fluctuation wind. This is pure speculation though.

The other requirement for space travel is energy. A thought experiment published by physicist Robert Foward in 1984 demonstrated how the Casimir force could in principle, be used to extract energy from the quantum vacuum (Phys. Rev. B, 30, 1700, 1984). Theoretical studies in the early 1990's (Phys. Rev. E, 48, 1562, 1993) verified that this was not contradictory to the laws of thermodynamics (since the zero-point energy is dfferent from a thermal reservoir of heat). Unfortunately, the Foward process cannot be cycled to yield a continuous extraction of energy. A Casimir engine would be one whose cylinders could only fire once, after which the engine becomes useless.

Origin Of Zero-Point Energy

The basis of zero-point energy is the Heisenberg uncertainty principle ... one of the fundamental laws of quantum physics. According to this principle, the more precisely one measures the position of a moving particle, such as an electron, the less exact, the best possible measurement of momentum (mass times velocity) will be, and vice versa. The least possible uncertainty of, position times momentum, is specified by Planck's constant, h. A parallel uncertainty exists between measurements involving time and energy. This minimum uncertainty is not due to any correctable flaws in measurement, but rather reflects an intrinsic quantum fuzziness in the very nature of energy and matter.

A useful calculational tool in physics is the ideal harmonic oscillator (a hypothetical mass on a perfect spring moving back and forth). The Heisenberg uncertainty principle dictates, that such an ideal harmonic oscillator ... one small enough to be subject to quantum laws ... can never come entirely to rest, since that would be a state of exactly zero energy ... which is forbidden !! In this case, the average minimum energy is 1/2h x the frequency, hf/2.

Radio waves, light, X-rays, and gamma rays are all forms of electromagnetic radiation. Classically, electromagnetic radiation can be pictured as waves flowing through space at the speed of light. The waves are not waves of anything substantive, but are in fact, ripples in a state of a field. These waves do carry energy, and each wave has a specific direction, frequency and polarization state. This is called a "propagating mode of the electromagnetic field".

Each mode is subject to the Heisenberg uncertainty principle. To understand the meaning of this, the theory of electromagnetic radiation is quantized by treating each mode as an equivalent harmonic oscillator. From this analogy, every mode of the field must have hf/2 as its average minimum energy. That tiny amount of energy, but the number of modes is enormous, and indeed increases as the square of the frequency. The product of the tiny energy per mode, times the huge spatial density of modes, yeilds a very high theoretical energy density per cubic centimeter.

From this line of reasoning ... quantum physics predicts that all of space must be filled with electromagnetic zero-point fluctuations (also called the zero-point field), creating a universial sea of zero-point energy. The density of this energy depends critically on where in frequency, the zero-point fluctuations cease. Since space itself, is thought to break up into a kind of quantum foam, at a tiny distance scale, called the Planck scale (10 to the -33 cm), it is argued that the zero point fluctuations must cease at a corresponding Planck frequency (10 to the 43 Hz). If that is the case, the zero-point energy density would be 110 orders of magnitude greater than the radiant energy at the center of the Sun.

Connection To Inertia And Gravitation

When a passenger in an airplane feels pushed against his seat as the airplane accelerates down the runway, or when a driver feels pushed to the left when his/her car makes a sharp turn to the right ... what is doing the pushing ? Since the time of Newton, this has been attributed to an innate property of matter ... called inertia. In 1994, a process was discovered, whereby, the zero-point fluctuations could be the source of the push, one feels when changing speed or direction, both being forms of acceleration. The zero-point fluctuations could be the underlying cause of inertia. If that is the case ... then we are actually sensing the zero-point energy with every move we make.

The principle of equivalence would require an analogous connection for gravitation. Einstein's general relativity, successfully accounts for the motions of freely falling objects on geodesics (the "shortest" distance between two points in curved spacetime), but does not provide a mechanism for generating a gravitational force for objects, when they are forced to deviate from geodesic tracks. It has been found, that an object undergoing acceleration or one held fixed in a gravitational field, would experience the same kind of asymmetric pattern in the zero-point field, giving rise to such a reaction force. The weight you measure on a scale would be therefore, be due to zero-point energy.

In conclusion ......

The possibility that electromagnetic zero-point energy may be involved in the production of inertial and gravitational forces, opens the possiblity that both inertia and gravitation might someday be controlled and manipulated. Which in turn ... could have a profound impact on propulsion and space travel.

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